Utilizing the exhaust of engines



(No Model.)

D. RENSHAW.

UTILIZING THE EXHAUST 0F ENGINES. I No. 298,119. Patented May 6,1884.

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NITED STATES PATENT OFFIC,

DAVID RENSHAW, OF BRAIN TREE, MASSACHUSETTS.

UTILIZING THE EXHAUST OF ENGINES.

SPECIFICATION forming part of Letters Patent No. 298,119, dated May 6,1884.

Application filed February 21, 1883. Renewed October 10, 1883. (Nomodel.)

- To on whom it may concern:

Be it known that I, DAVID RENSHAW, of apparatus.

Braintree, in the county of Norfolk and State of Massachusetts, haveinvented certain new and useful Improvements in the Process of Utilizingthe. Exhaust of Engines; and I do hereby declare that the following is afull, clear, and exact description of the invention, which willenableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawing, and to theletters of reference marked thereon, which form part of thisspecification.

The object of this invention is the utilization of the exhaust ofengines, and consequent saving of the greater portion of the heat nowlost in the working of engines.

It consists, first, in producing and maintaining in a superheater agreater pressure than its source of supply, (which in this case is theworking boiler or reservoir.) ;This is done by devices shown inapplication Serial No. 86,129. This highlyhheated steam, of greaterpressure than the working boiler, is then conducted to an injectorlocated between the superheater and boiler, and then brought in contactwith the exhaust, and also with water taken from the boiler, said waterbeing delivered to the injector under boiler pressure and temperature,or under the boiler-pressure and partially cooled, or under atmosphericpressure, cooled or not, as desired, the effect of which is the returnof all of the steam and water to the boiler from which they were taken.

The accompanying drawing shows a side elevation of one method ofillustrating my invention, the superheater being in section, andembodies some of the features shown in application Serial No. 86,223.

A is the boiler or vessel. B is the livesteam injector, and O theexhaust-steam injector-the former for supplying the superheater, and thelatter for forcing the combined mixture into the supply-boiler.

D is the atmospheric cooling-tank, and E the cooling-vessel underboiler-pressure. F is the superheater, and Y its temporary water-supplytank.

The connecting-pipes and valves will be alluded to and their functionpointed out in the description setting forth the operation. of the Theoperation is as follows: A sufficient quantity of water, by openingvalve ac, is allowed to pass from tank Y to the superheater, which, whenturned into steam and highly superheated, will give a pressure as muchgreater as may be desired than the working pressure raised on boiler A.The valve 00 is then closed. The superheater having attained the desiredpressure, valves S and m are opened, which allows water to pass from theboiler A at the temperature and pressure due to it into and through theinjector B. Valves w w are at the same time opened, which allows steamto pass from boiler A, through pipe at, to and through injector B, andalso allows a portion of the highly-superheated steam of greaterpressure than the boiler A to pass into pipe h, and through the injectorB, whereby the higher pressure is maintained on said superheater, whilea portion of the steam superheated in it is passing through pipe 0 tothe injector O, for the purpose of forcing the exhaust through it andback into the boiler A, from which it was taken, the exhaust passingfrom the engine to the injector 0 through pipe d.

The water used in working injectors G and B passes from boiler A throughpipes b and l,- or the injectors O and B may be furnished with water atthe boiler-pressure, but partially cooled, by closing valve S andopening valves q and 0, allowing the boiler-water under pressure to passthrough cooling-coil f, located in tank E, and from thence through pipesb and Z to injectors B and 0. Further, the water necessary for theworking of injectors B and C may be furnished to them atatmosphericpressure. In such case the valves S, q, and r will be closedand valve G on pipe 9 opened, allowing the boiler-water to pass intoopen tank D, from which it is carried to the injector 0 through pipe h,and to the injector B through pipe h, pipe Z, and pipe b.

The arrangement of the parts may be differently located, as occasion andcircumstances may require, as I lay no claim to the particulararrangement shown.

Having described my invention ,what I claim as new, and desire to secureby Letters Patent, 1s

1. The process herein described of utilizing the exhaust of engines byfirst injecting live steam with a small quantity of water into asuperheater by means of the steam previously superheated in saidsuperheater, thereby producing and maintaining a high pressure in thesuperheater, then injecting a portion of the boiler-water with theexhaust of the engine into the boiler by means of a subsidiary i11-jector working under a superior pressure, as set forth.

